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In the DOMException specification, I find: const unsigned short TYPE_MISMATCH_ERR = 17; // historical; use TypeError instead But TypeError does not seem to be defined in the spec. Is there a problem here? This is under this section: https://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#exception-domexception
TypeError is a native JavaScript exception. I'll make it read "historical; use JavaScript's TypeError instead" after I'm done with some other edits.
https://github.com/whatwg/dom/commit/6f0a44ab360b54ea0c02a0aa191b61dcbd629b9c
Next commit will add you to the acknowledgments. Keep forgetting that :-(